Re: [PATCH] __bitmap_parselist: fix bug in empty string handling

[Andrew Morton]

On Fri, 17 Apr 2015 14:00:04 -0400 Chris Metcalf <cmetcalf@xxxxxxxxxx> wrote:

> bitmap_parselist("", &mask, nmaskbits) will erroneously set bit
> zero in the mask.  The same bug is visible in cpumask_parselist()
> since it is layered on top of the bitmask code, e.g. if you boot with
> "isolcpus=", you will actually end up with cpu zero isolated.
> 
> The bug was introduced in commit 4b060420a596 ("bitmap, irq: add
> smp_affinity_list interface to /proc/irq") when bitmap_parselist()
> was generalized to support userspace as well as kernelspace.
> 
> Signed-off-by: Chris Metcalf <cmetcalf@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

I don't think we need to backport a fix for a 4 year old bug which has
very minor consequences.  Am I wrong?
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